Google Glass can be fun to use, but there still isn’t really a compelling reason to strap on the wearable device on a regular basis let alone pay $1500 for a pair of your own. Now British grocery chain Tesco may have come up with the first killer app for Glass as part of an effort to make it even easier to order new milk when you run out. The Tesco Google Glass app lets you scan the barcode for everyday items offered by the company, like the jug of milk featured in a new promotional video. The display then shows an info card with nutritional information for your milk and lets you quickly add it to a virtual basket and finalize your order. Then Tesco will deliver the milk by truck.